I recently purchased a one owner, 1978 Cheyenne, FWD, 400 turbo. The truck is in excellent condition inside and out. The only problem with it is that the small block 400 has a pretty good size hole in the oil pan that indicates an untimely departure of a piston rod. Knowing that I need to replace this engine, I would prefer to replace it with a 350 CID. Can anyone tell me for sure that this will be a straight swap? One of my concerns is the converter/flywheel. Any help would be appreciated.

I also have a 1976 Cheyenne and a 1981 Scottsdale. I have done a lot of restoration work on quite a few trucks, including a 1951 Chevy Suburban. I live in New Mexico and we still have some nice trucks here.

I recently purchased a one owner, 1978 Cheyenne, FWD, 400 turbo. The truck is in excellent condition inside and out. The only problem with it is that the small block 400 has a pretty good size hole in the oil pan that indicates an untimely departure of a piston rod. Knowing that I need to replace this engine, I would prefer to replace it with a 350 CID. Can anyone tell me for sure that this will be a straight swap? One of my concerns is the converter/flywheel. Any help would be appreciated.

I also have a 1976 Cheyenne and a 1981 Scottsdale. I have done a lot of restoration work on quite a few trucks, including a 1951 Chevy Suburban. I live in New Mexico and we still have some nice trucks here.

I can be contacted at [email]jdt40u@yahoo.com[/email

Thanks for your help

Chris

i know a site for you, it is www.67-72chevytrucks.com , it is for 47-98 chevy trucks, i am on the 73-87 message board part, put me as your referral, my name is the same there as it is here, 82c10

If you swap in everything that goes with a 350 (dampener and flywheel/flexplate) you'll be fine as the engine are the same size...

If you have a running 350 you can stick in then i'd say go for it. Though I will say that you could rebuild that 400 with a new bore job and a rebuild kit. It would make a darn nice engine for your truck...

not to make you confused..i will be very clear....it is a direct bolt in...all small block chevys will bolt in...the 400 does have a diferent flywheel and balancer...so when you get the 350 make sure you use 350 balancer -flywheel or it will have a nasty vibration

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